Improvement in calendar-clocks



NiTEn STATES PATENT rtree..

GEORGE B. OVEN, OF

NEV YORK, N. Y.

IMPROVEMENT IN CALENDAR-CLOCKS.

Specification forming part of Letters Patent No. 54,198, dated April 24, 1866.

To all 'whom it may concern:

IBe it known that I, GEORGE B. OWEN, ot the city, county, and State of New York, have invented a new and Improved Calendar Attachment for Clocks; and I. do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in Which- Figure l is a front sectional view of a clock with my invention applied to it; Fig. 2, afront view of the lower part of the same.

Similar letters ot' reference indicate like parts.

The object of this invention is to obtain a simple and economical device which may be applied to clocks and operated from the movements thereof, so as to indicate the days ot' the month.

Various calendar attachments have been devised for clocks, but they have not been generally adopted on account of being expensive and liable to get out of repair, and to render the clocks to which they are applied very inaccurate time-keepers, difficulties which, it is believed, are fully obviated by my invention.

A represents a clock-case, and B the frame ,received therein, in which the movement is placed.

C represents a portion of the dial of the clock. These parts, being ot' usual construction and well known, require no special description.

D represents an annular plate, which is tted in bearings a, attached to the inner surface ot' the front of the case. This annular plate is allowed to turn freely between the bearings a., and the latter may be provided with frictionrollers, it' desired, to insure the free rotation of said plate. The plate D is divided into thirty-one (3l) equal parts, being numbered from one (l) to thirty-one, (31,) inclusive, and an opening` is made in the front ot' the close case opposite the lever part of the annular plate, said opening being suiijciently large to expose the numbers on the plate, one number being exposed at a time. (See Fig. 2.)

The inner edge of the plate D is notched or toothed, the teeth being alternately large and small, b being the large, and c the small, teeth, as shown clearly iu Fig. l.

E represents a lever, the fulcrum-pin d of which passes into the frame B. The other end ot' this lever has a pendent pawl, F, attached to it, which pawl engages with the teeth l) c, at the inner edge of the plate D, and the opposite end of said lever bears against a cam, G, which is fitted ou the sleeve of the hourhand H.

The cam G, it will be seen, makes one revolution every twelvehonrs as it moves with the hour-hand, and the cam G is ot such a shape that it will move the plate D one tooth at the termination of each revolution every twelve hours. These movements ot the plate D are not all alike. They are alternately greater and less, owing to the difference in the length of the teeth l) c. The object of this is to prevent the plate D being moved sufficiently far to expose a number through the opening in the front of the clockcase at each revolution of the cam G. A new number should be exposed only for every two revolutions of the cam-that is, every twenty-four hours, one day. Hence, it will be seenthat it' the plate D is set at the rst day ot' each month, so that the number l will be inline wit-h the opening in the iront of the clock-case, andthe plate D turned sufticiently far every twenty-four hours to expose the numbers on said plate consecutively, from l upward, the dayot` the month will be indicated.

In order to set the plate D at the commence ment of each month a rod, H', is connected with the outer end of the lever E, said rod eX- tending back through a slot in the rear side ofthe clock-case. By actuating this rod H the lever E and pawl F will be operated and the plate D turned.

I would remark that instead of having the plate D provided with large and small teeth alternately, they may be ot` equal size, and the motion of the cam G reduced by means ot' gears, so as to make one revolution only in twenty-four hours. This, however, would be more complicated and interior to the plan described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The annular plate D, numbered and opening` in the front of the clock-ease, so that toothed, and placed between bearings a, so as to be capable of rotating,` freely, in connection the plate D will be moved under two revolutions of cani G to expose a succeeding number with the Cain Gr, lever E, and pawl F, or their through said opening only once in twenty-four equivalents, applied to a clock-movement, to operate substantially in the manner as and for the purpose herein set forth.

2. Providing the plate D with alternate large and small teeth, iu connection with the GEO. B. OWEN.

hours.

Witnesses M. M. LIVINGSTON, ALEX. F. RQBERTS. 

